The Dark Knight, by comparison, reached $500 million on its 45th day in theaters; Avatar, the all-time box-office champ, in 32 days.

If The Avengers performs like The Dark Knight did after the Batman movie's 23-day mark, then it'll be powerful enough to put another $100 million in the bank, and rival Titanic for the No. 2 spot on the all-time list.

And if the Marvel superhero movie performs like Avatar, then it'll have $335 million left in the tank, and the potential to make more history.

But as big and fast as The Avengers is, it's simply not performing like the James Cameronphenomenon, which barely dipped from weekend to weekend.

Here's a rundown of the five top-grossing movies of all-time, domestically, per the latest estimates from BoxOfficeMojo.com stats: